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TRG-TRC011-EN 55
period five
Application Considerations
notes
Combination Chiller Plants
Absorption chillers possess two operating characteristics that can noticeably
improve overall system efficiency and reduce system energy costs.
First, absorption chillers use fossil fuels rather than electricity. Operating
absorption chillers at times when on-peak electric energy and/or demand costs
are high reduces total system utility costs. In such installations, the absorption
chiller can operate during on-peak periods to avoid the high cost of electricity.
The electric chiller can run during off-peak periods to take advantage of the
lower cost of electricity.
Combination gas-and-electric plants can also exploit the heating capability of
direct-fired absorption chillers. Both electric and absorption chillers can be used
to provide summer cooling. If the electric chiller is large enough to satisfy the
entire winter cooling load, the direct-fired absorption chiller can be switched to
heating operation to either satisfy the entire winter heating load or supplement
the primary heating equipment. In such applications, selection of the direct-
fired absorption chiller should be made to allow downsizing, or perhaps even
elimination of, the primary heating equipment.
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
operate
absorption
chiller
operate
operate
absorption
absorption
chiller
chiller
operate
electric
chiller
operate
operate
electric
electric
chiller
chiller
on-peak
period
on
on
-
-
peak
peak
period
period
cooling load
cooling load
cooling load
operate
electric
chiller
operate
operate
electric
electric
chiller
chiller
Figure 63